Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › Engine Mount life span

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  • March 14, 2022 at 12:23 pm #128678

    Paul Thompson
    Participant
    Vessel Name: All In
    Engines: Cummins 6BTA 330 hp
    Location: MDR
    Country: United States

    I just purchased a 38 Mediterranean with twin Cummins 6BTA 5.9 motors. When in gear and at idle the motors both seem to shake and vibrate. Just off idle (750 rpm) the boat/motors immediately become smooth. The idle is 650 rpm. (unfortunately 750 rpm will put me a 6 knts, too fast for my marina’s no wake zone)<br />I have a few questions.

    Is that typical? I have a friend who has the same boat but with CAT 3116 motors and his boat also has the same vibration at idle.

    How long should motor mounts last? There are only 1500 hrs on the motors but the boat is 23 yrs old so I wonder if changing the motor mounts will lessen the issue.
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  • March 14, 2022 at 4:47 pm #128694

    Tony Athens
    Moderator
    Vessel Name: Local Banks
    Engines: QSB 6.7 550 HP
    Location: Oxnard, CA
    Country: USA

    Post some really good pictures of your isolators.

    Front and rear,Ā  multiple views.

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